Improvement in steam-boilers



UITED STATES PATENT EEICE.

PETER SVEENEY, OF BUFFALO, NEWT YORK.

IMPROVEMENT IN STEAM-BOILERS.

Specification forming part of Letters Patent No. 11,089, dated June 13, 1854.

To @ZZ whom t 71mg concern.:

Be it known that I, PETER SWEENEY, of Bulalo, in the county of Erie and State of New York, have invented a new and useful Improvement in Steam Boilers; and I do hereby declare that the following is a full, clear, and exact description of the same, reference being had to the accompanying drawings. forming part of this specification, in which- Figure l is a vertical section through the center of a steam-boiler constructed according to my invention. Fig. 2 is a horizontal section of the same in the line x of Fig. l.

Similar'letters of reference indicate correspending parts in both figures.

This invention consists in placing within a boiler of cylindrical or other form an annular casing containing sand or other poor cond ucting material,said casing dividing the interior ot' the boiler,l so as to form a central water-cylinder communicating at the bottom with an external annular water-space. The external water-space is exposed to the heat of the iire, but Vexposes only a thin body of water to its action at a time, while the water f in' the cylinder is at a comparatively low temperature. The effectof thisis to raise steam very rapidly in the external water-space, and to keep up a constant circulation of waterfrom the cylinder to the said space to supply the place of that evaporated.

To enable those skilled in the art to make and use my invention, I will proceed to describe its construction and operation.

A represents the outer shell ot the boiler, which is in the form of a cylinder placed vertically and having its top G and bottom Il of concave form internally. B is an inner cylinder of a diameter less than A, and C is another cylinder of a diameter about onethird of A. The cylinders B and O are united at the bottom by a ring I), which is of convex form outwardly, and at the top by a ring E of the form of an inverted frustuni of a cone. The cylinder' B is united with A by braces d d, and together with the cylinder C is supported by small standards b b, resting on the bottom I-I. The entire space between B and C is iilled with sand or any other poor conducting material, forming a non-conducting tube O. The space c between A and B is the. external water-space and the cylinder O is the central water-cylinder. The communication between the external space and central cylinder is all round the narrow space CZ between the ring D and the bottom of the boiler. Thewater when at the proper level reaches nearly to the top of C and c, but is neverintended to overflow from one to the other. The concave top G of the boiler forms a steam chamber or dome, froml the top of which rises the steam-pipe I. The feed-pipeJ enters the central cylinder C, and the gage-cock K also communicates with the said cylinder. The blowoii pipe P leads from the bottom of the boiler through the central cylinder O and passes through the ,dome G.

The tire-place L is immediately under the boiler, and the flame and heated products of combustion pass up an annular iue M, which entirely surrounds the outside of the boiler'. The chimney N leaves the upper part of this flue. The heating-surface is the bottom .l-I of the boiler and the outside of the cylinder A, all of which, except a small portion in the center of the bot-tom, is but thinly covered with water. The heat is thus concentrated upon a small quantity of water, being prevented in a great measure by the nonconducting tube O from being absorbed by the water in the central cylinder, which is only kept at sucha temperature as to prevent the condensation of the steam in the steam-chamber. The steam generated in the spaces (Z and c passes upward through cinto the steamchamber, and fresh water to take the place of thatevaporated is supplied by gravitation from C, which may be considered as a reservoir. Thus a constant and rapid circulation of the whole of the water is always kept up, as indicated by arrows in Fig. I.

This boiler is not of costly construction, and is very durable. It is free Jfrom liability to accident, as it is scarcely possible for any part which is exposed directly to the tire to be left uncovered by water. i c

Vhat I claim as my invention, and desire to secure by Letters Patent, is-

Dividing; the interior of the boiler by an inder C, in which the water is kept'nt a Commlnulm' casing B C, iled with non-comlluoti parat-iveiy 10W temperature, substantially as ing materiahor by a non-Conducting tube O, herein set forth. formed in any Convenient and suitable mem- PE'FER S\VEENEY. ner, so as to form an external Water-Space c, XVitnesses; which exposes a Jshin body of water to the HORACE PRENTIOE, action of the re, and am inner or central oyi- EDWD. F. FOLGER. 

